Role of Mixed Metal Oxides in Heterogeneous Catalysis

Burange, Anand S.; Gawande, Manoj B.

doi:10.1002/9781119951438.eibc2458

Cited by 12 publications

(4 citation statements)

References 83 publications

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“…Mixed metal oxide (MMO) is one of the most important photocatalysts, with features that differ from ordinary oxides in circumstances such as acid-base, redox, and surface area. These have been widely explored for several catalytic applications due to their excellent chemical-thermal stability compared to single oxides [70][71][72].…”

Section: Mixed-metal-oxide-based Photocatalystmentioning

confidence: 99%

Recent Advances of Photocatalytic Hydrogenation of CO2 to Methanol

2022

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Constantly increasing hydrocarbon fuel combustion along with high levels of carbon dioxide emissions has given rise to a global energy crisis and environmental alterations. Photocatalysis is an effective technique for addressing this energy and environmental crisis. Clean and renewable solar energy is a very favourable path for photocatalytic CO2 reduction to value-added products to tackle problems of energy and the environment. The synthesis of various products such as CH4, CH3OH, CO, EtOH, etc., has been expanded through the photocatalytic reduction of CO2. Among these products, methanol is one of the most important and highly versatile chemicals widely used in industry and in day-to-day life. This review emphasizes the recent progress of photocatalytic CO2 hydrogenation to CH3OH. In particular, Metal organic frameworks (MOFs), mixed-metal oxide, carbon, TiO2 and plasmonic-based nanomaterials are discussed for the photocatalytic reduction of CO2 to methanol. Finally, a summary and perspectives on this emerging field are provided.

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Section: Mixed-metal-oxide-based Photocatalystmentioning

confidence: 99%

Recent Advances of Photocatalytic Hydrogenation of CO2 to Methanol

2022

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“…The use of oxide systems for the organization of catalytic processes primarily involves an increase in the specific surface area of the carrier. Another important parameter is the need for maximum concentration of catalytically active centers with high donor-acceptor capacity [20].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Analysis of technological approaches to electrochemical surface treatment of aluminum alloys

Karakurkchi

Сахненко

Ved

et al. 2020

EEJET

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strength characteristics, alloying components (manganese, iron, copper, silicon, magnesium, etc.) are introduced into alloys, which form intermetallic compounds in the alloy structure. This causes the surface heterogeneity of alloyed aluminum alloys, significantly reduces corrosion resistance in aggressive media and complicates the surface treatment of such materials [9]. To give additional functional properties to the surface, surface modification methods are used, when predetermined indicators can be achieved without changing the structure of the base material [10]. Such surface engineering technologies are in demand and promising. Application of thin-film coatings for surface protection and strengthening [11, 12], formation of catalytically active layers [13, 14], electrochemical [15] and plasma-chemical treatment are the most common [16]. Variations and combinations of treatment methods

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“…In recent years, mixed-metal oxides have been widely used for the catalytic oxidation of soot, CO, and volatile organic compounds due to their comparable catalytic activity and high thermal and chemical stabilities compared to single-component oxides [ 7 , 8 ]. Kuwahara et al reported that the doping of Fe into Mn 2 O 3 significantly increased the concentration of adsorbed oxygen, resulting in a decrease in the T 50 of the MnO x catalyst from 339 °C to 328 °C for soot oxidation [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Soot Oxidation over Co-Based Metal Oxides: Effects of Transition Metal Doping

Luo,

Zhu,

Zhong

et al. 2023

Molecules

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A series of Co-M (M = Fe, Cr, and Mn) catalysts were synthesized by the sol-gel method for soot oxidation in a loose contact mode. The Co-Fe catalyst exhibited the best catalytic activity among the tested samples, with the characteristic temperatures (T10, T50, and T90) of 470 °C, 557 °C, and 602 °C, respectively, which were 57 °C, 51 °C, and 51 °C lower than those of the CoOx catalyst. Catalyst characterizations of N2 adsorption–desorption, X-ray diffraction (XRD), X-ray photo-electron spectrometry (XPS), and the temperature programmed desorption of O2 (O2-TPD) were performed to gain insights into the relationships between the activity of catalytic soot oxidation and the catalyst properties. The content of Co2+ (68.6%) increased due to the interactions between Co and Fe, while the redox properties and the relative concentration of surface oxygen adsorption (51.7%) were all improved, which could significantly boost the activity of catalytic soot oxidation. The effects of NO and contact mode on soot oxidation were investigated over the Co-Fe catalyst. The addition of 1000 ppm of NO led to significant reductions in T10, T50, and T90 by 92 °C, 106 °C, and 104 °C, respectively, compared to the case without the NO addition. In the tight contact mode, the soot oxidation was accelerated over the Co-Fe catalyst, resulting in 46 °C, 50 °C, and 50 °C reductions in T10, T50, and T90 compared to the loose contact mode. The comparison between real soot and model Printex-U showed that the T50 value of real soot (455 °C) was 102 °C lower than the model Printex-U soot.

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Role of Mixed Metal Oxides in Heterogeneous Catalysis

Cited by 12 publications

References 83 publications

Recent Advances of Photocatalytic Hydrogenation of CO2 to Methanol

Recent Advances of Photocatalytic Hydrogenation of CO2 to Methanol

Analysis of technological approaches to electrochemical surface treatment of aluminum alloys

Enhanced Catalytic Soot Oxidation over Co-Based Metal Oxides: Effects of Transition Metal Doping

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